Example: add photo-taking agent demo

examples/photo-taking-agent/.gitignore

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+credentials.json
+token.json
+.tools_cache.json
+tools/
+email_list.txt

examples/photo-taking-agent/README.md

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+# Photo-taking Agent Demo
+
+This example is a demo about taking a photo by using compute tool with agent.
+
+## User scenario
+
+1. users request to take a photo.
+2. the agent takes a picture by using compute tool.
+3. users can request to transform their photos into sticker photos.
+4. the agent transforms user's photo into sticker photos by calling diffusion model.
+5. once users get their desired sticker photos, they can request to get their photos via email.
+
+## Prerequisite
+
+1. Install `node`(for javascript), `uv`(for python) to bundling packages.
+
+```shell
+brew install uv
+brew install node
+```
+
+2. Sync dependencies
+
+```shell
+uv sync
+```
+
+3. Set auth app client_id and client_secret in `.secrets.toml`(optional)
+
+```toml
+[auth.github]
+client_id = ""
+client_secret = ""
+
+[auth.slack]
+client_id = ""
+client_secret = ""
+
+[auth.google]
+client_id = ""
+client_secret = ""
+```
+
+4. Set `openai_api_key` and `github_token` in environment variables or python-dotenv
+
+```shell
+export OPENAI_API_KEY=""
+export GITHUB_TOKEN=""
+```
+
+or write this in `.env`
+
+```text
+GITHUB_TOKEN=""
+OPENAI_API_KEY=""
+```
+
+5. Set `PHOTO_BOOTH_PICTURE_PATH` and `DIFFUSION_MODEL_URL` in environment variables or python-dotenv
+
+```shell
+export PHOTO_BOOTH_PICTURE_PATH=""
+export DIFFUSION_MODEL_URL=""
+```
+
+```text
+PHOTO_BOOTH_PICTURE_PATH=""
+DIFFUSION_MODEL_URL=""
+```
+
+6. set your google oauth `credentials.json`
+- ref [here](https://developers.google.com/gmail/api/quickstart/python#configure_the_oauth_consent_screen)
+
+7. Run `main.py`
+
+```shell
+uv run python main.py
+```